Basics of Organic Reaction Mechanism MCQs Question and Answer in Engineering Chemistry

1

The decreasing order of nucleophilicity for the following anions is CH₃C$${\text{O}}_2^ - $$, CH₃O^-, C₆H₅O^-, N$${\text{O}}_3^ - $$

A) CH₃C$${\text{O}}_2^ - $$ > CH₃O^- > C₆H₅O^- > N$${\text{O}}_3^ - $$ B) CH₃O^- > N$${\text{O}}_3^ - $$ > C₆H₅O^- > CH₃C$${\text{O}}_2^ - $$ C) CH₃O^- > C₆H₅O^- > CH₃C$${\text{O}}_2^ - $$ > N$${\text{O}}_3^ - $$ D) C₆H₅O^- > CH₃O^- > N$${\text{O}}_3^ - $$ > CH₃C$${\text{O}}_2^ - $$

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Answer & Solution

Answer: Option D

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2

The most appropriate sequence of the reactions for carrying out the following conversion
Basics of Organic Reaction Mechanism mcq question image

Basics of Organic Reaction Mechanism mcq question image

is

A) (i) peracid, (ii) H⁺, (iii) Zn/dil.HCl B) (i) Alkaline KMnO₄, (ii) NalO₄, (iii) N₂H₄/KOH C) (i) Alkaline KMnO₄, (ii) H⁺, (iii) Zn/dil.HCl D) (i) O₃/Me₂S, (ii) NaOEt, (iii) N₂H₄/KOH

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Answer & Solution

Answer: Option D

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3

Which of the following compounds is expected to show a sharp singlet for one of its protons at δ ≥ 8 ppm in ¹H NMR spectrum, given that this signal remains unaffected on shaking the solution thoroughly with D₂O?

A) CH₃CO₂H B) CH₃CONHC₆H₅ C) n-C₆H₁₃C ≡ CH D) n-C₆H₁₃CHO

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Answer & Solution

Answer: Option B

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4

Conversion of Ph-NH₂ into Ph-CN can be accomplished by

A) reaction with sodium cyanide in the presence of nickel catalyst B) reaction with chloroform and sodium hydroxide C) diazotisation followed by reaction with CuCN D) reaction with ethyl formate followed by thermolysis

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Answer & Solution

Answer: Option C

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5

The absolute configuration for compounds X and Y respectively are
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A) R, S B) S, R C) R, R D) S, S

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Answer & Solution

Answer: Option A

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6

The reactive intermediate involved in the conversion of phenol to salicylaldehyde using chloroform and sodium hydroxide is

A) Cl₂C: B) Cl₂CH⁺ C) Cl₂CH^- D) Cl₂C⁺

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Answer & Solution

Answer: Option A

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7

Order of reactivity of the following dienes X, Y and Z in Diels-Alder reaction is
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A) X > Z > Y B) Y > X > Z C) Y > Z > X D) X > Y > Z

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Answer & Solution

Answer: Option D

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8

The binaphthol (Bnp) is
Basics of Organic Reaction Mechanism mcq question image

A) an optically active compound with (R)-configuration B) an optically inactive compound C) a meso compound D) an optically active compound with (S)-configuration

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Answer & Solution

Answer: Option D

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9

Aniline can be distinguished from methyl amine by its reaction with

A) p-toluene sulphonyl chloride/KOH B) (i) NaNO₂/HCl, 0-5°C (ii) alkaline β naphthol C) Sn/HCl D) Acetyl chloride

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Answer & Solution

Answer: Option B

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10

For the compound,
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the stereochemical notations are

A) 2Z, 4R B) 2Z, 4S C) 2E, 4R D) 2E, 4S

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Answer & Solution

Answer: Option D

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